find-lowest-breaking-dep.sh

#!/usr/bin/env bash
composer install --no-dev
for DEP in $(composer show -N); do
    echo
    echo "*** downgrading ${DEP} ***"
    echo
    composer update $DEP --prefer-lowest --prefer-stable 
    composer test 
    TEST_FAILED=$?
    if [[ $TEST_FAILED -gt 0 ]]; then
        echo 
        echo "*** test failed when downgrading ${DEP} ***"
        echo
        exit 1
    fi
    composer update $DEP
done